Propagation and Elimination of Torque Ripple in A Wind Energy Conversion System

The 2P and 4P harmonics of the torque supplied by a two blade vertical axis wind turbine (WT) propagates in the drive train of the wind turbine and deteriorates the quality of the electric power transmitted to the network. This paper shows how the torque ripple propagates and how it can be eliminated by electrical instead of mechanical means. This elimination is obtained by using a converter-fed synchronous generator and by adopting suitable control strategies.